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Q&A for scientists using computers to solve scientific problems

DECLARE @TagName varchar(255) = '##TagName##';

DECLARE @PostCountByMonth TABLE
(
  [date] datetime,
  [##TagName##Count] int,
  UNIQUE CLUSTERED ([date])
);

INSERT INTO @PostCountByMonth
SELECT dateadd(month, DATEDIFF(month, '', p.CreationDate), '') [date],
      count(*) [##TagName##Count]
FROM
  (
    SELECT p.CreationDate
    FROM Posts p
      INNER JOIN PostTags pt on pt.PostId = p.Id
      INNER JOIN Tags t on pt.TagId = t.Id
    WHERE t.TagName = @TagName  
  ) p
GROUP BY DATEDIFF(month, '', p.CreationDate)
ORDER BY DATEDIFF(month, '', p.CreationDate);

SELECT p1.[date], sum(p2.[##TagName##Count]) [count]
FROM @PostCountByMonth p1 INNER JOIN @PostCountByMonth p2
  ON p1.[date] >= p2.[date]
GROUP BY p1.[date]

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edited nov 2 12 nonnb

created dec 13 10 prof3ta